netdev - Re: [PATCH net] net: wwan: iosm: Fix error handling path in ipc_pcie

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Date:   Sat, 8 Apr 2023 17:32:51 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
Cc:     m.chetan.kumar@...el.com, linuxwwan@...el.com,
        loic.poulain@...aro.org, ryazanov.s.a@...il.com,
        johannes@...solutions.net, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        error27@...il.com, kernel-janitors@...r.kernel.org,
        vegard.nossum@...cle.com
Subject: Re: [PATCH net] net: wwan: iosm: Fix error handling path in
 ipc_pcie_probe()

On Fri, Apr 07, 2023 at 11:56:07PM -0700, Harshit Mogalapalli wrote:
> Smatch reports:
> 	drivers/net/wwan/iosm/iosm_ipc_pcie.c:298 ipc_pcie_probe()
> 	warn: missing unwind goto?
> 
> When dma_set_mask fails it directly returns without disabling pci
> device and freeing ipc_pcie. Fix this my calling a correct goto label
> 
> As dma_set_mask returns either 0 or -EIO, we can use a goto label, as
> it finally returns -EIO.
> 
> Renamed the goto label as name of the label before this patch is not
> relevant after this patch.

nit: I agree that it's nice to name the labels after what they unwind,
rather than where they are called from. But now both schemes
are used in this function.
> 
> Fixes: 035e3befc191 ("net: wwan: iosm: fix driver not working with INTEL_IOMMU disabled")
> Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
> ---
> This is based on static analysis, only compile tested.

I agree with your analysis.

Reviewed-by: Simon Horman <simon.horman@...igine.com>